/*
 * Copyright (C) 2021 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.ohosannotations.internal.core.handler;

import java.util.Set;

import javax.lang.model.element.Element;
import javax.lang.model.type.TypeMirror;

import org.ohosannotations.OhosAnnotationsEnvironment;
import org.ohosannotations.ElementValidation;
import org.ohosannotations.annotations.sharedpreferences.Pref;
import org.ohosannotations.annotations.sharedpreferences.SharedPref;
import org.ohosannotations.handler.MethodInjectionHandler;
import org.ohosannotations.helper.InjectHelper;
import org.ohosannotations.holder.EComponentHolder;
import org.ohosannotations.holder.GeneratedClassHolder;

import com.helger.jcodemodel.AbstractJClass;
import com.helger.jcodemodel.IJAssignmentTarget;
import com.helger.jcodemodel.JBlock;
import com.helger.jcodemodel.JExpr;

/**
 * 参照处理程序
 *
 * @author dev
 * @since 2021-07-22
 */
public class PrefHandler extends CoreBaseAnnotationHandler<EComponentHolder>
    implements MethodInjectionHandler<EComponentHolder> {
    private final InjectHelper<EComponentHolder> injectHelper;

    /**
     * 参照处理程序
     *
     * @param environment 环境
     */
    public PrefHandler(OhosAnnotationsEnvironment environment) {
        super(Pref.class, environment);
        injectHelper = new InjectHelper<>(validatorHelper, this);
    }

    /**
     * 验证
     *
     * @param element 元素
     * @param validation 验证
     */
    @Override
    public void validate(Element element, ElementValidation validation) {
        injectHelper.validate(Pref.class, element, validation);
        if (!validation.isValid()) {
            return;
        }

        validatorHelper.isNotPrivate(element, validation);

        coreValidatorHelper.isSharedPreference(element, validation);
    }

    /**
     * 过程
     *
     * @param element 元素
     * @param holder 持有人
     */
    @Override
    public void process(Element element, EComponentHolder holder) {
        injectHelper.process(element, holder);
    }

    /**
     * 得到调用块
     *
     * @param holder 持有人
     * @return {@link JBlock}
     */
    @Override
    public JBlock getInvocationBlock(EComponentHolder holder) {
        return holder.getInitBodyInjectionBlock();
    }

    /**
     * 赋值
     *
     * @param targetBlock 目标块
     * @param fieldRef 现场裁判
     * @param holder 持有人
     * @param element 元素
     * @param param 参数
     */
    @Override
    public void assignValue(JBlock targetBlock,
        IJAssignmentTarget fieldRef, EComponentHolder holder, Element element, Element param) {
        TypeMirror fieldTypeMirror = param.asType();
        AbstractJClass prefClass = getJClass(fieldTypeMirror.toString());

        String elementTypeName = fieldTypeMirror.toString();
        int index = elementTypeName.lastIndexOf(".");
        if (index != -1) {
            elementTypeName = elementTypeName.substring(index + 1);
        }

        Set<? extends Element> sharedPrefElements = getEnvironment()
            .getValidatedElements().getRootAnnotatedElements(SharedPref.class.getName());
        for (Element sharedPrefElement : sharedPrefElements) {
            GeneratedClassHolder sharedPrefHolder = getEnvironment().getGeneratedClassHolder(sharedPrefElement);
            String sharedPrefName = sharedPrefHolder.getGeneratedClass().name();

            if (elementTypeName.equals(sharedPrefName)) {
                prefClass = sharedPrefHolder.getGeneratedClass();
                break;
            }
        }

        targetBlock.add(fieldRef.assign(JExpr._new(prefClass).arg(holder.getContextRef())));
    }

    /**
     * 验证封装元素
     *
     * @param element 元素
     * @param valid 有效的
     */
    @Override
    public void validateEnclosingElement(Element element, ElementValidation valid) {
        validatorHelper.enclosingElementHasEnhancedComponentAnnotation(element, valid);
    }
}

